If you do not want to bother about copying and registering the comdlg32.ocx file (for which you might need administrator rights anyway), tell the developer of the software to check out following project, that shows how you can use the common dialog box (open and save) without using the ocx file and thus without need of registering it. It uses the comdlg32.dll directly with APIs, which is installed already on windows!http://www.ws-software.co.cc/TComdlgAPIEng.html

Guys you seem not to have the same problem, because your solutions are not working at all. I have been there done that over and over again. I am worried about the Registry rather for it to have its default settings again. How would that be done over the command prompt.